<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div id="app">
    <button @click="fn">切换显示/隐藏 标题</button>
    <h3 v-show="isShow">黑马程序员</h3>
  </div>
  <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
  <script>
  const app = new Vue({
    el: '#app',
    data: {
      isShow: true
    },
    methods: {
      fn() {
        this.isShow = !this.isShow
      }
    }
  })
  </script>
</body>
</html>